I’d keep them all cross tied and hobbled, wearing thongs in my barn and work them extra hard to build more muscle. They would be required to work sporting 40 lb. stock saddles on their backs and duel pitchforks. The fittest would become part of the stable, the others would be put out to pasture.
One very special pony boy would be allowed to sleep indoors on a mat next to the stove and close to the fridge so breakfast wouldn’t be late. lol